7mm Detachable magnetic anti-interference EMI Noise filter ring

Features: 
Used to reduce electromagnetic interference from the outside world, greatly improve the quality. 
Can be used in power line, audio line, AV line, data line, USB wire,earphone line and other wires. 
High temperature resistance, corrosion resistance, detachable design, corresponding magnetic ring buckle can be adapted according to the diameter of the line, very convenient, and could be used repeatedly.